202101221131 has 4 divisors (see below), whose sum is σ = 202104461592. Its totient is φ = 202097980672.

The previous prime is 202101221117. The next prime is 202101221149. The reversal of 202101221131 is 131122101202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202101221131 is a prime.

It is a super-2 number, since 2×202101221131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202101221171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1524805 + ... + 1652038.

It is an arithmetic number, because the mean of its divisors is an integer number (50526115398).

Almost surely, 2^202101221131 is an apocalyptic number.

202101221131 is a deficient number, since it is larger than the sum of its proper divisors (3240461).

202101221131 is an equidigital number, since it uses as much as digits as its factorization.

202101221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3240460.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 202101221131 its reverse (131122101202), we get a palindrome (333223322333).

The spelling of 202101221131 in words is "two hundred two billion, one hundred one million, two hundred twenty-one thousand, one hundred thirty-one".